<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>

<div class="header">
    <h4>header</h4>
</div>

<div class="container">
  
  <div class="left">
      <h4>left</h4>
      <p>left-content</p>
  </div>
  <div class="middle">
    <h4>middle</h4>
    <p>middle-content</p>
  </div>
  <div class="right">
    <h4>right</h4>
    <p>right-content</p>
  </div>
  <div class="right">
    <h4>right</h4>
    <p>right-content</p>
  </div>
  <div class="right">
    <h4>right</h4>
    <p>right-content</p>
  </div>
</div>

<div class="footer">
  <h4>footer</h4>
</div>
</body>
<style>
.header, .footer {
  border: 1px solid #333;
  background: #ccc;
  text-align: center;
}
.container {
  display: flex;
  flex-wrap: wrap;
}
.left {
  width: 200px;
  background: red;
}
.middle {
  background: blue;
  width: 800px;
}

.right {
  width: 220px;
  background: green;
}

</style>
</html>